SELECT avail_num from ((select rownum avail_num from ieu_uwq_sel_enumerators aa) union all (select rownum + (select count(*) from ieu_uwq_sel_enumerators) avail_num from ieu_uwq_sel_enumerators bb))
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SELECT AVAIL_NUM FROM ((SELECT ROWNUM AVAIL_NUM FROM IEU_UWQ_SEL_ENUMERATORS AA) UNION ALL (SELECT ROWNUM + (SELECT COUNT(*) FROM IEU_UWQ_SEL_ENUMERATORS) AVAIL_NUM FROM IEU_UWQ_SEL_ENUMERATORS BB))